Influence of long-term operation of ground source heat pump on geothermal field in heat transfer area
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摘要:
为了研究夏热冬冷地区地埋管地源热泵系统长期运行对换热区域地温场的影响，以南昌市某建筑地埋管地源热泵工程为例，对该示范工程4年间换热区域内外地温场变化特征和冷热堆积进行分析. 该工程设置了7个温度监测孔，分别在地埋管孔群中央以及周边由近及远不同距离对该系统运行4年间地埋管换热区域地温场进行了全面的监测. 分析结果表明：本地源热泵工程持续运行4年间，地埋管换热区域内外地温均随热泵运行呈现周期性变化；地温在垂向上随深度增加而增大，变化幅度逐渐减小；径向上，地埋管换热区周围地温波动随着远离地埋管呈现逐渐减小的趋势；该地源热泵系统持续运行4年中，地埋管孔群换热的热影响半径在3~6 m之间；系统持续运行4年后，孔群边界平均地温仅升高0.13 ℃，热堆积现象不明显. 该分析结果可为地埋管换热孔场地设计提供依据.
Abstract:To study the influence of long-term operation of ground source heat pump (GSHP) on geothermal field in heat transfer area of hot-summer and cold-winter regions, taking a GSHP project in Nanchang City as an example, this paper analyzes the variation characteristics of geothermal field and heat-cold accumulation inside and outside the heat transfer area of the demonstration project over four years of operation. The project arranges seven temperature monitoring holes in the center and surrounding areas of the GSHP group for comprehensive monitoring of geothermal field changes in heat transfer area during the four-year operation. The analysis results show that the geothermal temperature inside and outside the heat transfer area changes periodically with the four-year operation of GSHP; The geothermal temperature increases with increasing depth vertically, and the variation range decreases gradually; Radially, geothermal temperature variations around the heat transfer area gradually decreases with increasing distance from hole group; The thermal influence radius of the hole group is 3-6 m during the four-year operation; The average temperature at the hole group boundary increases merely by 0.13 ℃, indicating insignificant heat accumulation after the four-year operation. These findings provide references for the site design of GSHP heat transfer holes.
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表 1 研究区地层特征
Table 1. Stratigraphic characteristics of the study area
序号 土层名称 层底深度/m 厚度/m 1 填土 0.7 0.7 2 粉质黏土 9.7 9.0 3 细砂 15.9 6.2 4 中砂 17.7 1.8 5 粗砂 23.7 6.0 6 砾砂 29.2 5.5 7 圆砾 36.6 7.4 8 强风化泥质粉砂岩 38.1 1.5 9 中风化泥质粉砂岩 48 9.9 10 微风化泥质粉砂岩 101.3 53.3 
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表 2 各测试孔岩土体热物性参数统计结果
Table 2. Statistics of thermophysical parameters of rock-soil body in test holes
测试孔编号 设定功率/kW 单位延米换热量/（W/m） 拟合系数k 岩土体导热系数/（W·m-1·K-1） 单位深度钻孔总热阻/（m2·K/W） 热扩散率/（m2/d） 13号 3 32.54 1.0997 2.36 0.209 0.065 6 63.65 2.0142 2.52 0.196 0.069 2号 3 28.32 1.1564 1.95 0.234 0.054 6 58.20 2.1611 2.14 0.215 0.059
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表 3 17#监测孔运行一年后各深度处温度变化
Table 3. Temperature changes at different depths after one-year operation of No. 17 monitoring hole
深度/m 20 30 40 60 70 80 90 100 初始温度/℃ 19.46 18.64 18.4 20.8 20.8 16.38 20.28 14.38 温度/℃ 19.63 19.05 18.4 20.9 20.9 16.18 20.37 15.48 温差/℃ 0.17 0.41 0 0.1 0.1 -0.2 0.09 1.1
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表 4 各监测孔2017—2021各年度6月上旬平均温度及温度变化
Table 4. Average temperatures and variation of monitoring holes in early June during 2017-2021
监测 T1 T2 T3 T4 T5 T2-T1 T3-T1 T4-T1 T5-T1 18 20.82 20.77 20.76 20.88 20.88 -0.05 -0.06 0.06 0.07 19 20.85 20.84 20.96 21.08 21.08 -0.01 0.10 0.23 0.23 20 20.81 20.84 20.86 20.88 20.91 0.03 0.05 0.07 0.10 平均值 20.83 20.82 20.86 20.95 20.96 -0.01 0.03 0.12 0.13 注：T1、T2、T3、T4、T5分别代表2017、2018、2019、2020、2021年温度. 温度单位：℃.
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